HISI, High-tech Submarine Interior, narrow industrial corridor in a high-tech submarine interior, dense network of red-painted pipes and conduits covering walls and ceiling, complex mechanical systems, pressure valves, gauges, analog dials, control panels with switches and indicator lights, exposed engineering infrastructure, metallic surfaces with worn paint and subtle grime, grated metal walkway floor with central alignment, strong linear perspective toward a sealed bulkhead door with rectangular frame and small inset window at the end of the corridor, overhead fluorescent strip lighting with cold white glow, high contrast reflections on metal, warm red ambient tones dominating scene, confined claustrophobic atmosphere, utilitarian naval design, symmetrical composition, high detail textures, cinematic depth